Crossword Genius

With which writer makes a point? (6,9)

Ross

I believe the answer is:

pencil sharpener

I'm a little stuck... Click here to teach me more about this clue!

'a point?' is the definition.
Both the answer and definition are singular nouns.
I also know that 'point' relates to this answer.

'with which writer' is the wordplay.
I cannot really understand how this works, but
'writer' could be 'pencil' (something which writes) and 'pencil' is located in the answer.
The remaining letters 'sharpener' is a valid word which might be clued in a way I don't understand.
This may be the basis of the clue (or it may be nonsense).

'makes' is the link.

Can you help me to learn more?

(Other definitions for pencil sharpener that I've seen before include "that makes lead go further" , "It's used to make a point" , "shaving device" , "something struggling writer might resort to" , "Desk item" .)

I've seen this clue in The Guardian.
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